Experimental Studies of Anode and Cathode Materials in a Repetitive-Driven Axial Vircator

Elfsberg, Mattias; Hurtig, Tomas; Larsson, Anders; Moller, Cecilia; Nyholm, S.E.

doi:10.1109/ppps.2007.4345790

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…Experiments with the cathode of the same shape and size, but with solid emission surface (solid cathode) carried out in similar conditions gave the twice smaller radiated power. Similar results were obtained by the authors of [6]- [10] who reported the sensitivity of radiated power to cathode material, shape, and cathode-anode gap.…”

Section: Introductionsupporting

confidence: 90%

“…A similar mechanism leads to the formation of currentdensity peaks (maxima) (Figs. 10,11). The electrons that escape from the convex explosive-emission center are repulsed.…”

Section: Current Density Distributionmentioning

confidence: 99%

“…The interaction between these repulsing microflows gives rise to peaks and dips in the current density distribution (Figs. 10,11).…”

Section: Current Density Distributionmentioning

confidence: 99%

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Simulation of Electron Beam Dynamics in a Nonmagnetized High-Current Vacuum Diode

Anishchenko,

Gurinovich

2016

Preprint

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Section: Introductionsupporting

confidence: 90%

“…A similar mechanism leads to the formation of currentdensity peaks (maxima) (Figs. 10,11). The electrons that escape from the convex explosive-emission center are repulsed.…”

Section: Current Density Distributionmentioning

confidence: 99%

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Simulation of Electron Beam Dynamics in a Nonmagnetized High-Current Vacuum Diode

Anishchenko,

Gurinovich

2016

Preprint

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“…Plasma may also form at the surface of the anode due to near surface ionization of the outgassed neutral atoms by the anode's desorbed electrons or secondary electrons. This can cause pulse-shortening of an HPS device 9 and, in the long-term, erosion of the anode 10 . This paper presents a hydrogen outgassing reduction technique at the core of which is a microstructural transformation caused by laser melting the surface of the HPS metal anodes.…”

Section: Introduction 11 Anodes In High Power Source Devicesmentioning

confidence: 99%

Laser stimulated grain growth in 304 stainless steel anodes for reduced hydrogen outgassing (Erratum)

Gortat

Sparkes

Fairchild

et al. 2017

Fiber Lasers XIV: Technology and Systems

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Metal anodes in high power source (HPS) devices erode during operation due to hydrogen outgassing and plasma formation; both of which are thermally driven phenomena generated by the electron beam impacting the anode's surface. This limits the lowest achievable pressure in an HPS device, which reduces its efficiency. Laser surface melting the 304 stainless steel anodes by a continuous wave fiber laser showed a reduction in hydrogen outgassing by a factor of ~4 under 50 keV electron bombardment, compared to that from untreated stainless steel. This is attributed to an increase in the grain size (from 40 -3516 m 2 ), which effectively reduces the number of characterized grain boundaries that serve as hydrogen trapping sites, making such laser treated metals excellent candidates for use in vacuum electronics.

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Experimental Studies of Anode and Cathode Materials in a Repetitive-Driven Axial Vircator

Cited by 2 publications

References 2 publications

Simulation of Electron Beam Dynamics in a Nonmagnetized High-Current Vacuum Diode

Simulation of Electron Beam Dynamics in a Nonmagnetized High-Current Vacuum Diode

Laser stimulated grain growth in 304 stainless steel anodes for reduced hydrogen outgassing (Erratum)

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